And Because the spectrum of the discrete time signal, this same spectrum will periodically repeat if we extended the frequency increased beyond $f_s$ this kind of the spectrum proven is usually the same spectrum in each individual frequency band from $nf_s$ to $(n+1)f_s$ for any integer $n$. a : ore https://pgforboysingurugram.blogspot.com/2025/07/affordable-boys-pg-in-gurgaon-sector-15.html